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Message-ID: <88433dd6-6eeb-1874-8a77-cc79582bf79a@quicinc.com>
Date: Mon, 9 Dec 2024 11:59:04 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
Stanimir Varbanov
<stanimir.k.varbanov@...il.com>,
Vikash Garodia <quic_vgarodia@...cinc.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>
CC: <quic_renjiang@...cinc.com>, <quic_vnagar@...cinc.com>,
<konradybcio@...nel.org>, <linux-media@...r.kernel.org>,
<linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] media: venus: Add support for static video
encoder/decoder declarations
On 11/28/2024 9:51 PM, Bryan O'Donoghue wrote:
> Add resource structure data and probe() logic to support static
> declarations of encoder and decoder.
>
> Right now we rely on video encoder/decoder selection happening in the dtb
> but, this goes against the remit of device tree which is supposed to
> describe hardware, not select functional logic in Linux drivers.
>
> Provide two strings in the venus resource structure enc_nodename and
> dec_nodename.
>
> When set the venus driver will create an OF entry in-memory consistent
> with:
>
> dec_nodename {
> compat = "video-decoder";
> };
>
> and/or
>
> enc_nodename {
> compat = "video-encoder";
> };
>
> This will allow us to reuse the existing driver scheme of relying on compat
> names maintaining compatibility with old dtb files.
>
> dec_nodename can be "video-decoder" or "video0"
> enc_nodename can be "video-encoder" or "video1"
>
> This change relies on of_changeset() API as a result select OF_DYNAMIC will
> be added to venus/Kconfig
>
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
> drivers/media/platform/qcom/venus/Kconfig | 1 +
> drivers/media/platform/qcom/venus/core.c | 90 +++++++++++++++++++++++++++++++
> drivers/media/platform/qcom/venus/core.h | 4 ++
> 3 files changed, 95 insertions(+)
>
> diff --git a/drivers/media/platform/qcom/venus/Kconfig b/drivers/media/platform/qcom/venus/Kconfig
> index bfd50e8f34219db8a1de7960d7ea93b20db2982a..bc2e410b29cb415a36540a4f98709eae44f4ec35 100644
> --- a/drivers/media/platform/qcom/venus/Kconfig
> +++ b/drivers/media/platform/qcom/venus/Kconfig
> @@ -3,6 +3,7 @@ config VIDEO_QCOM_VENUS
> depends on V4L_MEM2MEM_DRIVERS
> depends on VIDEO_DEV && QCOM_SMEM
> depends on (ARCH_QCOM && IOMMU_DMA) || COMPILE_TEST
> + select OF_DYNAMIC if ARCH_QCOM
> select QCOM_MDT_LOADER if ARCH_QCOM
> select QCOM_SCM
> select VIDEOBUF2_DMA_CONTIG
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 4e26b18790537885a77d66c1917a4e7a146eaf57..8a085611443cfda89ae71496e320dfc1f02ade88 100644
> --- a/drivers/media/platform/qcom/venus/core.c
> +++ b/drivers/media/platform/qcom/venus/core.c
> @@ -286,6 +286,89 @@ static irqreturn_t venus_isr_thread(int irq, void *dev_id)
> return ret;
> }
>
> +#if defined(CONFIG_OF_DYNAMIC)
> +static int venus_add_video_core(struct venus_core *core, const char *node_name,
> + const char *compat)
> +{
> + struct of_changeset *ocs = core->ocs;
> + struct device *dev = core->dev;
> + struct device_node *np, *enp;
> + int ret;
> +
> + if (!node_name)
> + return 0;> +
> + enp = of_find_node_by_name(dev->of_node, node_name);
> + if (enp) {
> + of_node_put(enp);
> + return 0;
> + }
> +
> + np = of_changeset_create_node(ocs, dev->of_node, node_name);
> + if (!np) {
> + dev_err(dev, "Unable to create new node\n");
> + return -ENODEV;
> + }
> +
> + ret = of_changeset_add_prop_string(ocs, np, "compatible", compat);
> + if (ret)
> + dev_err(dev, "unable to add %s\n", compat);
> +
> + of_node_put(np);
> +
> + return ret;
> +}
> +
> +static int venus_add_dynamic_nodes(struct venus_core *core)
> +{
> + struct device *dev = core->dev;
> + int ret;
> +
> + core->ocs = kmalloc(sizeof(*core->ocs), GFP_KERNEL);
> + if (!core->ocs)
> + return -ENOMEM;
> +
> + of_changeset_init(core->ocs);
> +
> + ret = venus_add_video_core(core, core->res->dec_nodename, "venus-decoder");
> + if (ret)
> + goto err;
> +
> + ret = venus_add_video_core(core, core->res->enc_nodename, "venus-encoder");
> + if (ret)
> + goto err;
> +
> + ret = of_changeset_apply(core->ocs);
> + if (ret) {
> + dev_err(dev, "applying changeset fail ret %d\n", ret);
> + goto err;
> + }
> +
> + return 0;
> +err:
> + of_changeset_destroy(core->ocs);
> + kfree(core->ocs);
> + core->ocs = NULL;
> + return ret;
> +}
> +
> +static void venus_remove_dynamic_nodes(struct venus_core *core)
> +{
> + if (core->ocs) {
> + of_changeset_revert(core->ocs);
> + of_changeset_destroy(core->ocs);
> + kfree(core->ocs);
> + }
> +}
> +#else
> +static int venus_add_dynamic_nodes(struct venus_core *core)
> +{
> + return 0;
> +}
> +
> +static void venus_remove_dynamic_nodes(struct venus_core *core) {}
> +#endif
> +
> static int venus_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -365,6 +448,11 @@ static int venus_probe(struct platform_device *pdev)
> if (ret < 0)
> goto err_runtime_disable;
>
> + if (core->res->dec_nodename || core->res->enc_nodename) {
> + if (venus_add_dynamic_nodes(core))
> + goto err_runtime_disable;
> + }
> +
> ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
> if (ret)
> goto err_runtime_disable;
venus_remove_dynamic_nodes should be called in error handling in probe as
well I think.
Thanks,
Dikshita
> @@ -443,6 +531,8 @@ static void venus_remove(struct platform_device *pdev)
>
> venus_firmware_deinit(core);
>
> + venus_remove_dynamic_nodes(core);
> +
> pm_runtime_put_sync(dev);
> pm_runtime_disable(dev);
>
> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
> index 27784fd7082c321222b23ca4b2902a04c49e19ca..306231b4f7d0201175974b4a42574f30d23e08f0 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -90,6 +90,8 @@ struct venus_resources {
> u32 cp_nonpixel_start;
> u32 cp_nonpixel_size;
> const char *fwname;
> + const char *enc_nodename;
> + const char *dec_nodename;
> };
>
> enum venus_fmt {
> @@ -171,6 +173,7 @@ struct venus_format {
> * @root: debugfs root directory
> * @venus_ver: the venus firmware version
> * @dump_core: a flag indicating that a core dump is required
> + * @ocs: OF changeset pointer
> */
> struct venus_core {
> void __iomem *base;
> @@ -235,6 +238,7 @@ struct venus_core {
> u32 rev;
> } venus_ver;
> unsigned long dump_core;
> + struct of_changeset *ocs;
> };
>
> struct vdec_controls {
>
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